A: sublimation
B: condensation
C: melting
Explanation:
When in a solid between the molecules we have only weak forces the solid may undergo a face transition end by increasing temperature it will transform in a gas without going through the liquid state. This is sublimation.
When we drop the temperature of a gas between a certain limit were the forces between the molecules are no longer inhibited so they will stick together in a liquid form. This is condensation.
When a solid is transformed in a liquid, the temperature is high enough to overcome interactions between the particles so the molecules will gain a degree of freedom. This is melting.
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